11 37 020 Removing and Installing/Replacing Servomotor for Eccentric Shaft (N55)

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Special Tools Required:

11 7 170 .

WARNING: The Preloading On The Throttle Return Springs Increases As The Rotation On The Worm Gear Increases. Danger of Injury!
The Eccentric Shaft May Only Be Twisted On The Mounting Flats for Protection.
Risk of Damage To The Eccentric Shaft Gearing and To The Servomotor Worm Drive.
The Eccentric Shaft Must Not Spring Back To The Minimum Stroke Stop. Risk of Damage!

Necessary Preliminary Tasks:

Remove CYLINDER HEAD COVER .
Remove IGNITION COILS AND INJECTOR SHAFTS of Cylinders 1 To 4.

WARNING: Heed Stop Installation Instructions.

The Eccentric Shaft On The Mounting Flats (2) Must Only Be Turned with An Open-End Spanner (1) for Support.

The Eccentric Shaft Has Mounting Flats On Both Sides ; If The Engine Is Installed, The Front Mounting Flat Must Be Used.

Heed The Following Work Instructions.

After The Engine Stops, The Eccentric Shaft Is In The Maximum Stroke Position.

If The Actuator Drive Is Defective, The Eccentric Shaft Is Located In An Undetermined Position.

Fig 1: Turning Mounting Flats On Eccentric Shaft Using Open-End Spanner

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Release Bolt (1) On The Oil Spray Nozzle.

Tightening torque: 11 37 4AZ .

Unclip Oil Spray Nozzle (2) From The Bracket On The Actuator Drive (3) In Direction of Arrow.

Fig 2: Removing Oil Spray Nozzle From Actuator Drive Bracket

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If The Eccentric Shaft Is Not On Maximum Stroke, The Eccentric Shaft Must Be Adjusted To Maximum Stroke.

IMPORTANT: Fix Eccentric Shaft with An Open-End Spanner (Kickback Danger)
Adjust Eccentric Shaft Only On The Hexagon Socket of The Actuator Drive (Preload).

Remove Minimum Stroke Stop (1).

Fig 3: Identifying Minimum Stroke Stop

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Turn 4-Mm Hexagon Socket Wrench (1) Clockwise In Direction of Arrow (Maximum Stroke).

Secure Eccentric Shaft with An Open-End Spanner (2) for Support In Direction of Arrow.

Fix Eccentric Shaft with An Open-End Spanner (2) (Kickback Danger)

Fig 4: Turning Hexagon Socket Wrench and Securing Eccentric Shaft Using Open-End Spanner

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Secure Eccentric Shaft (1) with Special Tool 11 7 170 .

Fig 5: Identifying Worm Gear and Special Tool (11 7 170)

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Remove Minimum Stroke Stop (1).

Tightening torque: 11 37 5AZ .

Fig 6: Identifying Stop

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Adjust Eccentric Shaft (1) To Minimum Stroke In Direction of Arrow Via Servomotor.

IMPORTANT: Secure Eccentric Shaft with An Open-End Spanner (Kickback Danger)

Fig 7: Adjusting Eccentric Shaft To Minimum Stroke

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Slowly Adjust Eccentric Shaft In Direction of Arrow To Minimum Stroke Via The Servomotor with A 4-Mm Hexagon Socket Wrench (2) and An Open-End Spanner (1).

IMPORTANT: Secure Eccentric Shaft with An Open-End Spanner (1) (Kickback Danger)

Release Gearing of The Eccentric Shaft From Worm Drive.

Fig 8: Adjusting Eccentric Shaft

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IMPORTANT: Eccentric Shaft (2) Is No Longer Connected To The Worm Drive of The Servomotor In This Working Position.

Turn Eccentric Shaft (2) Approximately 90° Further with An Open-End Spanner (1).

Secure Eccentric Shaft (2) Against Kickback with the Assistance of A Second Person.

Fig 9: Turning Mounting Flats On Eccentric Shaft Using Open-End Spanner

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Position Stop (1) of Eccentric Shaft At Stop of Maximum Stroke.

Fig 10: Locating Eccentric Shaft Stop

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Screw In Stop (1) for Minimum Stroke.

Tightening torque: 11 37 5AZ .

Installation Note:

The Eccentric Shaft Is Now Secured and Can No Longer Kick Back.

Fig 11: Identifying Stop for Minimum Stroke

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Unfasten Screws (2).

Fig 12: Identifying Screws

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Remove Servomotor (1) Upward In Direction of Arrow.

Installation Note:

Clean Blind Holes with Compressed Air.

Install Servomotor (1) Downward In Direction of Arrow.

Installation Note:

The Gearing of The Worm Gear and The Eccentric Shaft Must Be Greased with LONG-TIME PD 1 (4.1) .

Fig 13: Identifying Servomotor

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Insert Bolts (2).

Tightening torque: 11 37 3AZ .

Installation Note:

Eccentric Shaft (1) and Worm Drive Must Now Be Joined.

Fig 14: Identifying Screws

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Release Stop (1) of Minimum Stroke of Eccentric Shaft.

Tightening torque: 11 37 5AZ .

IMPORTANT: Secure Eccentric Shaft with An Open-End Spanner (Kickback Danger)

Fig 15: Identifying Stop for Minimum Stroke

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Preload Eccentric Shaft To Maximum Stroke with A 4-Mm Hexagon Socket Wrench (1) On The Servomotor In Direction of Arrow.

Fix Eccentric Shaft with An Open-End Spanner (2) for Support and Secure (Kickback Danger).

Fig 16: Turning Hexagon Socket Wrench and Securing Eccentric Shaft Using Open-End Spanner

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Adjust Eccentric Shaft (1) Toward Maximum Stroke In Direction of Arrow Via Servomotor.

IMPORTANT: Fix Eccentric Shaft with An Open-End Spanner and Secure. (Kickback Danger)

Fig 17: Adjusting Eccentric Shaft Toward Maximum Stroke

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Secure Eccentric Shaft (1) with Special Tool 11 7 170 .

Fig 18: Identifying Worm Gear and Special Tool (11 7 170)

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Screw In Stop (1) for Minimum Stroke.

Tightening torque: 11 37 5AZ .

IMPORTANT: Fix Eccentric Shaft with An Open-End Spanner and Secure. (Kickback Danger)

Fig 19: Identifying Stop

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Retract Oil Spray Nozzle (2) On Actuator Drive (3).

Engage Bolt (1) and Release Back To 90°.

for Exact Positioning of The Oil Spray Nozzle (2) Audibly Clip It In At The Top.

Secure Oil Spray Nozzle (2) with Screw (1).

Tightening torque: 11 37 4AZ .

Fig 20: Removing Oil Spray Nozzle From Actuator Drive Bracket

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Remove All Special Tools.

Assemble Engine.

Check Function of DME.

Service Function.
Drive.
Digital Motor Electronics
Valvetronic Run-In Procedure.